CVE-2026-55953

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 14.1% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Modified. NVD last modified this record on 2026-10-24.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-27 15:21Z3 MO AGO

Last updated

2026-09-08 01:06Z1 MO AGO

Reserved

2026-06-17

Assigning CNA

EEF

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Weaknesses

• CWE-757Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')Base

Data version

5.2

Document digest

32621e3cf244873148e2507b2ac846efbf07a23b51490f7a9dbbc3f59cd85391

• github.comhttps://github.com/erlang/otp/security/advisories/GHSA-c6cw-pr89-w882vendor-advisoryrelated
• cna.erlef.orghttps://cna.erlef.org/cves/CVE-2026-55953.htmlrelated
• osv.devhttps://osv.dev/vulnerability/EEF-CVE-2026-55953related
• www.erlang.orghttps://www.erlang.org/doc/system/versions.html#order-of-versionsx_version-scheme
• github.comhttps://github.com/erlang/otp/commit/064e236414614f9085cbbbd6eacf0e43c02d1b4bpatch
• github.comhttps://github.com/erlang/otp/commit/0a82596d425abe43dc2e0b3d74aa1557ef74051cpatch
• github.comhttps://github.com/erlang/otp/commit/e6ff938116b2872bccc478af7fefb56627285b77patch